An AI body-composition tracker where every "department" is a paid service or a Claude Code skill.
Run a one-person app company with Claude Code skills: GainFrame, $944 MRR
Writing your repeat jobs down as agent skills lets one person run release, QA and content like a small team.
Figures as shared by the creator · source
From @Kritnc on Reddit · Jul 2026
The Short Version
- What: The solo developer of GainFrame wrote Claude Code skills for engineering, QA, releases and content.
- Result: He reported $944 MRR, up 45% in the last month, with 203 active subscriptions four months after launch, and about $257 a month for the AI coach, his biggest infrastructure cost (Reddit, r/AppBusiness, Jul 2026).
- Made with: Claude Code, Gemini
The workflow
Made With
GeminiScript · Google's AI assistant for ideas, research and imagesTry Gemini AIMore Cases
Claude CodeUse · Anthropic's agentic coding tool that edits files and runs commands in your codebaseTry Claude Code AIMore CasesWhere & With What
What They Did
- 1The moveThe solo developer of GainFrame wrote Claude Code skills for engineering, QA, releases and content.
- 2Step 2Write rules for your coding agent
- 3Step 3Automate QA with an agent
- 4ResultHe reported $944 MRR, up 45% in the last month, with 203 active subscriptions four months after launch, and about $257 a month for the AI coach, his biggest infrastructure cost (Reddit, r/AppBusiness, Jul 2026).
Quick Answers
What tools do you need?
Claude Code (anthropic's agentic coding tool that edits files and runs commands in your codebase); Gemini (google's ai assistant for ideas, research and images).
How much does it cost?
You can start for $0: Gemini has a free plan. Claude Code is paid or trial-based. Check each tool's site for current prices.
Is it allowed?
Follow the platform rules and disclose ads.
Watch out: Self-reported, and he admits parts are over-engineered for $944 a month. Put hard limits on AI spend per user.
Try It Yourself
(Our template, not the creator's prompt.) Write a CLAUDE.md for my app: architecture rules, the design system, files never to touch, how to run tests and the definition of done for any feature.
Starter tools
Your first step
Open Gemini, paste the prompt above and swap the [brackets] for your own niche.
Full write-up & sources
More detail: Claude Code writes most of the code, guided by a CLAUDE.md file of architecture rules; a QA agent installs the app in the simulator and taps through features. The in-app AI coach streams Gemini Flash and can call 17 tools on the user's own data. A cron job alerts him if AI spend passes $35 a day.
Results: Earlier posts covered $5.7K he says he wasted on ads.
Source: @Kritnc on Reddit · Jul 2026. Summarised in our own words; figures as shared by the creator or shown on the platform. Updated .
